WO2012128344A1

WO2012128344A1 - Continuous kneading device

Info

Publication number: WO2012128344A1
Application number: PCT/JP2012/057458
Authority: WO
Inventors: 眞由美岩子; 雅章中尾; 龍司北村; 阿部　正和; 植田　稔晃; 博道小泉
Original assignee: 株式会社粉研パウテックス; 三菱マテリアル株式会社
Priority date: 2011-03-23
Filing date: 2012-03-23
Publication date: 2012-09-27
Also published as: TW201247310A; KR20140007897A; TWI551345B; JP5933298B2; US9700858B2; JP2012210621A; US20140010038A1; CN103442790A; CN103442790B; DE112012001378T5

Abstract

This continuous kneading device is provided with an upper trunk (1) to which a powder supply tube (3) through which quantified powder is supplied is connected and in which the powder is blended with a fluid, and a lower trunk (2) concentrically connected to the bottom of the upper trunk (1). The continuous kneading device continuously kneads the powder and the fluid by a first rotating kneading plate (10) built into the upper trunk (1) and a second rotating kneading plate (11) built into the lower trunk (2), wherein the first and second rotating kneading plates (10, 11) have a substrate surface covered with a coating material (50) for reducing friction when the powder and the fluid are kneaded together.

Description

Continuous kneader

The present invention relates to a continuous kneading apparatus for continuously mixing and kneading powder such as quartz powder and liquid, and continuous kneading capable of efficiently and continuously mixing fine particles of submicron order and liquid substance. Relates to the device.
This application claims priority based on Japanese Patent Application No. 2011-066463 filed in Japan on March 23, 2011, the contents of which are incorporated herein by reference.

Conventionally, a continuous kneading apparatus for continuously kneading a powder such as quartz powder and a liquid as shown in

Patent Documents

1 and 2 is known.
The continuous kneading apparatus of Patent Document 1 has a configuration in which kneading chambers each containing a rotary kneading machine are provided in multiple upper and lower stages, and powder and liquid are simultaneously supplied to the upper kneading chamber to perform kneading. The rotary kneader in the kneading chamber is set to a small diameter, the rotary kneader in the lower kneading chamber is set to a large diameter, and the powder kneaded with the liquid while moving in the centrifugal direction in the upper kneading chamber Is introduced directly from the outer peripheral edge of the upper rotary kneader into the kneading region on the rotary kneader in the lower kneading chamber.

In the continuous mixing apparatus of Patent Document 2, powder and liquid are continuously supplied into a mixing chamber provided with a rotating mixing disk, and a uniform mixed fluid of powder and liquid is obtained by the rotating mixing disk. In the above configuration, a non-metallic sleeve made of a thermoplastic resin having low heat generation with respect to friction is replaceably mounted on the inner surface of the mixing chamber.

JP 2002-191953 A JP 2004-290908 A

By the way, in the continuous kneading / mixing apparatus configured as described above, a stainless material is used as a base material for a rotating mixing board or the like that is a member that contacts and mixes a kneaded product (slurry) of powder and liquid. However, since the wettability of the surface of the slurry and the stainless steel material is good, the slurry adheres to the stainless steel material, and particularly when the object of kneading is fine particles of submicron order or less, good kneading can be performed. However, the viscosity of the slurry is increased, and as a result, the discharge property of the slurry from the apparatus is deteriorated, and the temperature of the slurry is increased to change the product characteristics.
In particular, the rotary kneader, which is a component of the apparatus, is rotatably supported via a bearing, so that the frictional heat is less likely to escape due to the small contact area with other members, which is higher than other members. It was temperature.

The present invention has been made in view of the above-mentioned circumstances, and has good kneadability with respect to the slurry at the time of rotary kneading, and ensures good dischargeability from the apparatus as the viscosity of the slurry is lowered. And it aims at providing the continuous kneading apparatus which can also reduce the temperature of a slurry.

The present inventors generally paid attention to the dynamic friction coefficient of a material because a material having a small dynamic friction coefficient is considered to have low wettability. Therefore, as a result of various tests conducted by changing the material of each member constituting the inside of the apparatus, specifically, the constituent member that is in direct contact with the object to be kneaded, the constituent member inside the apparatus is made of a material having a small dynamic friction coefficient. In addition, as the kneading progressed well, it was found that the viscosity of the slurry was lowered and the temperature of the slurry was also lowered, leading to the present invention.
The continuous kneading apparatus according to the present invention includes an upper cylinder to which a powder supply cylinder to which a quantified powder is supplied is connected and the powder is mixed with a liquid, and an upper cylinder below the upper cylinder to the upper cylinder. A lower drum connected concentrically, and a first rotary kneading plate built in the upper drum and a second rotary kneading plate built in the lower drum, In which at least the surfaces of the first and second rotary kneaders are made of a material having a smaller dynamic friction coefficient than metal. In addition, as a metal, stainless steel (JIS SUS304) is mentioned, for example.

In the continuous kneading apparatus according to the present invention, the surfaces of the first and second rotary kneaders are coated with a coating material, and the coating material is diamond-like carbon (also called amorphous carbon or amorphous carbon). DLC), polyetheretherketone (hereinafter referred to as PEEK), polytetrafluoroethylene (hereinafter referred to as PTFE), titanium nitride (hereinafter referred to as TiN), titanium carbonitride (hereinafter referred to as TiCN). Any of the above materials may be used.
In the continuous kneading apparatus according to the present invention, the inner surfaces of the upper cylinder and the lower cylinder may be coated with a coating material having a smaller dynamic friction coefficient than metal.
In the continuous kneading apparatus according to the present invention, the coating material coated on the inner surfaces of the upper cylinder and the lower cylinder may be a PEEK material.

According to the present invention configured as described above, at least the surfaces of the first rotary kneading plate located in the upper drum and the second rotary kneading plate located in the lower drum are made of a material having a smaller dynamic friction coefficient than metal. Has been. For example, DLC coating, PEEK coating, PTFE coating, TiN coating, TiCN coating are applied to the surface of the base material of the first rotary kneader located in the upper shell and the second rotary kneader located in the lower drum. Therefore, the coating material can provide a good kneadability of the slurry, and can reduce the viscosity of the slurry. Along with this, good dischargeability from the apparatus can be secured, and the temperature of the slurry and the temperature of the first and second rotary kneaders can be lowered.
In the continuous kneading apparatus according to the present invention, the first rotary kneader and the second rotary kneader may be made of a resin material having a lower dynamic friction coefficient than that of metal.

In the continuous kneading apparatus according to the present invention, the lower end of the upper cylinder is between the lower surface of the inner flange portion protruding radially inward of the upper cylinder and the upper surface of the second rotary kneading plate in the lower cylinder. A shear kneading part, the shear kneading part being fixed to the lower surface of the inner flange, and a rotating plate fixed to the upper surface of the second rotary kneader and rotating together with the second rotary kneader. The rotating plate rotates in a state of facing the upper surface of the fixed plate, thereby applying a shearing force to the kneaded material of the powder and liquid between the fixed plate and the rotating plate. In addition, at least the surfaces of the rotating plate and the fixed plate of the shear kneading unit may be made of a material having a lower dynamic friction coefficient than that of the metal.
Note that the rotation plate of the shear kneading part and the fixed plate are made of a material having a lower coefficient of dynamic friction than that of metal. Including the case where the surface of the material is coated with a material having a lower dynamic friction coefficient than that of the metal, and the case where the rotating plate and the fixed plate of the shear kneading part are made of the material itself having a lower dynamic friction coefficient than that of the metal. Meaning.

In the continuous kneading apparatus according to the present invention, uneven portions may be formed on the opposing surfaces of the fixed plate and the rotating plate of the shear kneading unit.

According to the present invention configured as described above, the fixed plate fixed to the lower surface of the inner flange portion of the upper body, and the rotation fixed to the upper surface of the second rotary kneader and rotating together with the second rotary kneader. A shear kneading part is composed of the plate, and the rotating plate of the shear kneading part rotates with respect to the fixed plate, so that a kneaded product (slurry) of powder and liquid is formed between the rotating plate and the fixed plate. A shearing force can be applied. At this time, a large shearing force is applied to the kneaded product (slurry) of the powder and liquid by forming a concavo-convex portion by a knurled cutting process or a concave groove on the opposing surfaces of the fixed plate and the rotating plate of the shear kneading unit be able to.
In the invention according to the present invention, the resin material having a lower coefficient of dynamic friction than the metal may be PEEK or PTFE.

According to the present invention, at least the surfaces of the first rotary kneader located in the upper drum and the second rotary kneader located in the lower drum are made of a material having a smaller dynamic friction coefficient than metal. For example, DLC coating, PEEK coating, PTFE coating, TiN coating and TiCN coating are applied to the surface of the base material of the first rotary kneader located in the upper shell and the second rotary kneader located in the lower shell. If so, the wettability of these coating materials is low, so that the good kneadability of the slurry can be obtained by the coating material, and the viscosity of the slurry can be lowered. Along with this, good dischargeability from the apparatus can be secured, and the temperature of the slurry can be lowered.

Further, according to the present invention, the shear kneading unit is constituted by the fixed plate fixed to the lower surface of the projecting portion of the upper body and the rotating plate fixed to the upper surface of the second rotary kneader and rotating together with the second rotary kneader. When the rotating plate of the shear kneading part rotates with respect to the fixed plate, a shearing force can be applied to the kneaded product of the powder and the liquid between the rotating plate and the fixed plate. At this time, a larger shearing force can be applied to the kneaded product of the powder and the liquid by knurling cutting or forming concave and convex portions by concave grooves on the opposing surfaces of the stationary plate and the rotating plate of the shear kneading portion. it can.

1 is a front sectional view of a continuous kneading apparatus 100 according to the present invention. It is a figure which shows the rotating plate 22 of the 2nd rotary kneading board 11 which knurled, (A) is a top view, (B) is a front sectional view of radial direction. It is a figure which shows the fixing plate 21 by the side of the upper trunk | body 1 which carried out the knurling process, Comprising: (A) is a bottom view, (B) is a front sectional view of radial direction. It is a figure which shows the rotating plate 22 of the 2nd rotary kneading board 11 in which the concave groove | channel was formed, Comprising: (A) is a top view, (B) is a front sectional view of radial direction. It is a figure which shows the fixing plate 21 by the side of the upper trunk | drum 1 in which the concave groove was formed, (A) is a bottom view, (B) is a front sectional view of radial direction. It is a table | surface which shows the difference in the dynamic friction coefficient when the base material which consists of a different metal material, and those surfaces are coat | covered with various coating materials. It is a table | surface which shows the Example which shows the viscosity of the slurry at the time of kneading | mixing with the continuous kneading apparatus 100 concerning this invention, and the continuous kneading apparatus concerning a comparative example, and the temperature of a slurry.

The continuous kneading apparatus according to the present invention will be described with reference to FIGS.
FIG. 1 is a front sectional view of a continuous kneading apparatus 100 according to the present invention. In this figure, the reference numeral 1 is an upper cylinder, and the reference numeral 2 is concentrically fixed to the lower side of the upper cylinder 1. The lower torso.

The upper body 1 has a first kneading chamber 1B inside the upper body 1A, and a powder supply device (not shown) for supplying a constant amount of powder to the upper portion of the first kneading chamber 1B. ) And a liquid supply pipe 4 connected to a liquid supply device (not shown) for supplying a liquid to be mixed with the powder.
Further,

flange portions

1C and 1D projecting outward in the radial direction are integrally formed on the upper edge portion and the lower edge portion of the upper body 1A of the upper body 1, and the powder portion is formed on the flange portion 1C. A supply cylinder 3 is fixed, and a lower body 2 is fixed to the flange portion 1D.

The lower body 2 has a second kneading chamber 2B inside the lower body 2A.
In addition, a flange portion 2C that protrudes radially outward is integrally formed on the upper edge portion of the lower trunk body 2A of the lower barrel 2, and the lower flange portion of the upper barrel 1 is formed on the flange portion 2C. Part 1D is contacted and fixed.
A bottom plate 2D disposed horizontally is integrally formed at the lower edge of the lower body 2A of the lower body 2, and a powder and liquid are disposed between the bottom plate 2D and the lower body 2A. And a discharge port 5 for discharging the slurry which is a kneaded product.

The inner diameter of the second kneading chamber 2B of the lower barrel 2 is formed larger than the inner diameter of the first kneading chamber 1B in the upper barrel 1, and the first kneading chamber 1B and the second kneading chamber 2B communicate with each other. It is provided in the state.
In the first kneading chamber 1B and the second kneading chamber 2B, a first rotary kneader 10 and a second rotary kneader 11 are arranged, respectively. 11 is driven by a common rotary drive shaft 12.
The rotary drive shaft 12 is supported by a bearing 13 so as to pass through the central portion of the bottom plate 2D, and is supplied to an external drive source (not shown) disposed at the lower end thereof and is rotationally driven. . A plurality of kneading pins 10 </ b> A are provided on the lower surface of the first rotary kneading board 10.

Since the inner diameter of the second kneading chamber 2B of the lower barrel 2 is formed larger than the inner diameter of the first kneading chamber 1B in the upper barrel 1, the lower portion of the upper barrel 1 is inward (rotation drive shaft 12). Side). Here, the inner side of the flange portion 1D of the upper body 1 protrudes toward the kneading

chambers

1B and 2B to form an inner flange portion 1DD, and these (outer) flange portion 1D and the lower surface of the inner flange portion 1DD, A shear kneading section 20 is provided between the upper surface of the second rotary kneading board 11 in the lower body 2.

The shear kneading unit 20 is fixed to the lower plate of the flange portion 1D and the inner flange portion 1DD of the upper body 1 and the upper surface of the second rotary kneading plate 11 and fixed to the second rotary kneading plate 11. A rotating plate 22 that rotates together with the rotating plate 22, and the rotating plate 22 rotates with the rotation of the second rotating kneading board 11, so that the kneaded product of the powder and liquid is fixed between these fixed plates 21. A shearing force is applied to the slurry.

Further, the peripheral portion and the lower surface side of the second rotary kneading platen 11 scrape the slurry from the inner surface portion of the lower trunk main body 2A and guide a side scraper 30 and a scraping blade 31 to the discharge port 5. Are arranged radially.
The supply of the liquid to the

pre-kneading chambers

1B and 2B is not limited to being performed through the powder supply cylinder 3, but an overflow cone is provided so as to surround the powder supply cylinder 3, and an annular overflow by the overflow cone is provided. What was comprised so that a liquid might flow down as a film | membrane may be further attached.

In addition, as shown in FIG. 2, the shear kneading unit 20 has a knurled cutting process in a predetermined direction on the upper surface of the rotary plate 22 of the second rotary kneader 11 with a predetermined width and the upper surface being inclined with respect to the circumferential direction ( (Denoted by reference numeral 22a). Further, as shown in FIG. 3, a knurled cutting process (reference numeral 21 a) is performed on the lower surface of the fixed plate 21 on the upper body 1 side that rotates relative to the rotating plate 22 in a direction intersecting with the knurling of the rotating plate 22. Is shown). Then, by forming irregularities by cutting 21a and 22a on the rotating plate 22 and the fixed plate 21, an appropriate shearing action is imparted to the slurry that is a kneaded mixture of powder and liquid, so that a homogeneous slurry can be easily formed. Can get to.
2 is a mounting screw for fixing the rotating plate 22 to the second rotary kneading platen 11, and the reference numeral 41 in FIG. 3 indicates that the fixing plate 21 is attached to the upper body 1. It is a mounting screw for fixing.

The first rotary kneading plate 10, the second rotary kneading plate 11, the first kneading chamber 1B in the upper barrel 1 and the second kneading chamber 2B in the lower barrel 2 have the powder and A coating material 50 (50A / 50B) for reducing friction between the powder and the slurry, which is a kneaded product of liquid, is coated during kneading with the liquid. The coating material 50 (50A / 50B) is formed so as to cover the entire surface including the knurled cutting work 21a / 22a provided on the rotating plate 22 and the fixed plate 21. For example, stainless steel is used as the base material, and materials such as DLC, PEEK, PTFE, TiN, and TiCN are used as the coating material coated on the base material.

Specifically, as shown in FIG. 1, as each coating material 50 (50A) covering the surfaces of the first rotary kneading board 10, the second rotary kneading board 11, the fixed plate 21, and the scraping blade 31, for example, DLC coating (material) is used, and the inner surface of the second kneading chamber 2B excluding the inner surface of the first kneading chamber 1B in the upper cylinder 1 and the DLC coating of the fixing plate 21 of the lower cylinder 2 or the surface of the solid PTFE material. For example, PEEK coating (material) is used as the coating material 50 (50B) that covers each of the two.

As described above, the reason why the DLC coating is used as the coating material 50 (50A) for the second rotary kneading plate 11, the fixed plate 21, the first rotary kneading plate 10, and the scraping blade 31 is as follows. That is, knurl-like cutting is performed on the opposing surfaces of the rotating plate 22 and the fixed plate 21 to form fine grooves, and when adopting a normal coating method, the fine grooves are filled. Therefore, there is a possibility that the original function of the fine groove, that is, the function of exerting a high shearing action may be impaired. However, when coating is performed by using, for example, a sputtering method using DLC, the fine groove is held as it is, and the fine groove has This is because the original function, that is, the function exerting a high shearing action can be sufficiently exhibited. In addition, since the coating by DLC is thin and uniform with a thickness of about 1 μm, even when a strong shear load is applied, the coating layer is difficult to peel off from the substrate.

The reason for using the PEEK material as the coating material 50B on the inner surfaces of the first kneading chamber 1B in the upper drum 1 and the second kneading chamber 2B in the lower drum 2 is, for example, when PTFE resin is used. In comparison, chemical resistance, water / oil repellency, and non-adhesiveness have the same performance, but wear resistance is ten times that of fluororesin. Also, the dynamic friction coefficient is equivalent to that of fluororesin, and it has a stable property against temperature changes.

In the continuous kneading apparatus 100 of the embodiment configured as described above, powder is continuously supplied into the powder supply cylinder 3 at the center of the upper surface of the first rotary kneading board 10 in the first kneading chamber 1B. At the same time, a liquid is supplied from the liquid supply pipe 4 by a liquid supply means (not shown), and the powder and the liquid are kneaded by the rotational drive of the first rotary kneading board 10, and then the kneaded product of the powder and the liquid is used. When a certain slurry passes between the rotating plate 22 and the fixed plate 21 of the shear kneading unit provided at the boundary between the first rotating kneading chamber and the 1B second kneading chamber 2B, an appropriate shear is applied to the slurry. The action is imparted and a homogeneous slurry can be easily obtained.

Further, in the continuous kneading apparatus 100, the powder and liquid are placed on the surface of the base material of the first rotary kneading board 10 located in the upper drum 1 and the second rotary kneading board 11 located in the lower drum 2. Coating material 50 (50A) that reduces friction with the slurry during kneading is coated. For example, since the DLC coating is applied to the surface of the base material of the first rotary kneading board 10 located in the upper drum 1 and the second rotary kneading board 11 located in the lower drum 2, the dynamic friction coefficient is determined by the coating material. As the slurry is lowered, good kneadability of the slurry is obtained, and a large aggregate of powders is eliminated, so that the viscosity of the slurry can be lowered. Along with this, it is possible to ensure good dischargeability of the slurry from the apparatus and to lower the temperature of the slurry.
Further, the inner surfaces of the upper cylinder 1 and the lower cylinder 2 are coated with a PEEK coating that reduces friction between the powder and the liquid and the slurry when kneaded with the powder. Good kneadability of the slurry can also be obtained at the contact portion, and the viscosity of the slurry can be lowered here as well.

In the continuous kneading apparatus 100 shown in the present embodiment, as described above, the fixing plate 21 fixed to the lower surface of the flange portion 1D of the upper body 1 and the upper surface of the second rotary kneading plate 11 are fixed to the first kneading apparatus 100. The shear kneading unit 20 is constituted by the rotating plate 22 that rotates together with the two-rotation kneading plate 11, and the rotating plate 22 of the shear kneading unit 20 rotates with respect to the fixed plate 21, so that the rotating plate 22 and the fixed plate 21 are rotated. In this case, a shearing force is applied to the slurry, which is a mixture of powder and liquid, and the surface of the rotary plate 22 and the fixed plate 21 is also provided with a DLC coating. Good kneadability can be obtained.

In addition, this invention is not limited to the above-mentioned embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
For example, in the shear kneading unit 20 of the above embodiment, a knurled cutting process (reference numeral) is provided on the upper surface of the rotating plate 22 of the second rotary kneading board 11 and the lower surface of the fixed plate 21 that rotates relative to the rotating plate 22. 21a and 22a), but is not limited to this. As shown in FIGS. 4 and 5, the concave shape is formed along the circumferential direction which is the rotational direction of the rotating plate 22 and at regular intervals in the radial direction.

Grooves

21b and 22b may be formed, and a shearing force may be applied to the slurry by the concave and convex portions formed by the

concave grooves

21b and 22b.
In this case, in order to prevent an increase in the temperature of the slurry caused by friction during mixing, suppress an increase in the viscosity of the slurry, and improve the discharge performance from the apparatus, the rotating plate 22 including these

concave grooves

21b and 22b. The entire upper surface and the lower surface of the fixing plate 21 are coated with the coating material 50 (50A).

In the present embodiment, the fluid is supplied together with the powder through the powder supply cylinder 3 connected to the upper body 1, but the present invention is not limited to this, and the fluid is supplied to the lower flange portion of the upper body 1. A liquid jet nozzle is provided in 1D, and liquid may be supplied directly to a location where the fixed plate 21 and the rotating plate 22 of the shear kneading unit 20 face each other (that is, a location where shear force is applied to the slurry). good.

Further, although the fixing plate 21 of the shear kneading unit 20 is fixed to the lower flange portion 1D of the upper body 1, the present invention is not limited to this, and the fixing plate 21 is opposite to the rotating plate 22. The slurry may be rotationally driven in a direction to apply a greater shearing force to the slurry.
Moreover, in the said embodiment, although the lower trunk | drum 2 is made larger diameter than the upper trunk | drum 1, it is also possible to set the lower trunk | drum 2 and the upper trunk | drum 1 to a comparable diameter, without being restricted to this. In this case, the fixing plate 21 may be fixed to the lower surface of the inner flange portion 1DD provided on the upper body 1.

In the embodiment, in the first rotary kneader 10, the second rotary kneader 11, the first kneading chamber 1 B in the upper barrel 1 and the second kneading chamber 2 B in the lower barrel 2, the surface of the base material The coating material 50 was applied to reduce friction with the slurry when the powder and liquid were kneaded. However, the present invention is not limited to this, and all or a part of the first rotary kneader 10 and the second rotary kneader 11 such as the side scraper 30 and the scraping blade 31 may be made of, for example, PEEK having a lower dynamic friction coefficient than metal. You may comprise with resin materials itself, such as PTFE. Similarly, the fixed plate 21 and the rotating plate 22 may be made of a resin material itself such as PEEK or PTFE having a lower dynamic friction coefficient than that of metal.

〔Example〕
First, aluminum (JIS A2014) and stainless steel (JIS SUS304) are prepared as the base material, the base material itself, the base material surface with TiN coating applied without coating, and the base material surface with TiCN Coated, DLC coated on the surface of the substrate, PEEK coated on the surface of the substrate, PTFE coated on the surface of the substrate, and their dynamic friction coefficients Was measured.
The dynamic friction coefficient was measured in a ball-on-disk friction test with a tribometer manufactured by CSEM under the condition that a load of 5 to 20 N was applied to a 6 mm diameter cemented carbide ball at room temperature.

The result is shown in FIG. As can be seen from this figure, the dynamic friction coefficient of aluminum was 0.6 and the dynamic friction coefficient of stainless steel was 0.5, whereas when these substrates were coated, the TiN coating was 0.4, and the TiCN coating was The dynamic friction coefficient was 0.3 for DLC coating or 0.1 for DLC coating or PEEK coating and 0.05 for PTFE coating.

Based on these results, 12 examples are prepared using the same structure as the continuous kneading apparatus 100 according to the embodiment of the present invention shown in FIGS. 1 to 3, and 3 comparative examples are prepared. Examples were prepared, and the viscosity of the slurry when the powder and liquid were actually kneaded, the temperature of the slurry, etc. were examined.
Specifically, 50 kg / h of quartz powder or food mix powder is supplied from the powder supply cylinder 3 and 34 liters / h of ion exchange water or saline is continuously supplied from the liquid supply pipe 4. Slurries were produced while rotating the two-

stage rotary kneaders

10 and 11 at 4000 rpm. The results are shown in FIG.

Here, in Example 1, the surfaces of the rotary kneaders 10 and 11, the surface of the scraping blade 31, the inner surface of the upper barrel 1 and the inner surface of the lower barrel 2 were respectively covered with DLC coating (material). This is an example in which food misc powder (powdered rice, starch, wheat protein, trehalose, thickening polysaccharide) as a powder raw material and 10 wt% saline as a liquid raw material are kneaded. Stainless steel was used as the base material for these members. Also in the following Examples 2 to 9, stainless steel was used as a base material for the rotary kneader 10 and the like.

Example 2 is an example in which quartz powder having a volume-based average particle diameter of 0.8 μm, which is a powder raw material, and ion-exchanged water, which is a liquid raw material, are kneaded using the same apparatus configuration as that of Example 1. In Example 3, the surface of the rotary kneaders 10 and 11, the surface of the scraping blade 31, the inner surface of the upper body 1 and the inner surface of the lower body 2 were respectively covered with PTFE coating (material), and the powder raw material was used. This is an example of kneading quartz powder and ion-exchanged water that is a liquid raw material. In Example 4, the surface of the rotary kneaders 10 and 11, the surface of the scraping blade 31, the inner surface of the upper body 1 and the inner surface of the lower body 2 were respectively covered with PEEK coating (material), and the powder raw material was used. This is an example of kneading quartz powder and ion-exchanged water that is a liquid raw material. Example 5 is a powder raw material in which the surfaces of the rotary kneaders 10 and 11, the surface of the scraping blade 31, the inner surface of the upper cylinder 1 and the inner surface of the lower cylinder 2 are respectively covered with TiCN coating (material). This is an example of kneading quartz powder and ion-exchanged water that is a liquid raw material. In Example 6, the surface of the rotary kneaders 10 and 11, the surface of the scraping blade 31, the inner surface of the upper body 1 and the inner surface of the lower body 2 were each covered with a TiN coating (material). This is an example of kneading quartz powder and ion-exchanged water that is a liquid raw material.

In Example 7, the surfaces of the rotary kneaders 10 and 11 and the surface of the scraping blade 31 are each covered with DLC coating (material), and the inner surface of the upper cylinder 1 and the inner surface of the lower cylinder 2 are respectively covered with PEEK coating (material). In this example, quartz powder, which is a powder raw material, and ion-exchanged water, which is a liquid raw material, are kneaded. In Example 8, the surfaces of the rotary kneaders 10 and 11 and the surface of the scraping blade 31 are each covered with TiCN coating (material), and the inner surface of the upper cylinder 1 and the inner surface of the lower cylinder 2 are respectively covered with PEEK coating (material). In this example, quartz powder, which is a powder raw material, and ion-exchanged water, which is a liquid raw material, are kneaded. In Example 9, the surfaces of the rotary kneaders 10 and 11 and the surface of the scraping blade 31 are each covered with a TiN coating (material), and the inner surface of the upper cylinder 1 and the inner surface of the lower cylinder 2 are respectively covered with a PEEK coating (material). In this example, quartz powder, which is a powder raw material, and ion-exchanged water, which is a liquid raw material, are kneaded.

In Example 10,

rotary kneaders

10 and 11, scraper blades 31, upper body 1 and lower body 2 were each made of PTFE material, and miscible powder for food as a powder material and salt as a liquid material. This is an example in which water is kneaded. In Example 11, the rotary kneaders 10 and 11 and the scraping blades 31 made of PEEK material were used, and the upper body 1 and the lower body 2 were made of PTFE material. This is an example in which a certain quartz powder and ion exchange water as a liquid raw material are kneaded. In the twelfth embodiment, the rotary kneaders 10 and 11, the raking blades 31, the upper drum, and the lower drum 2 are each made of PEEK material, and only the inner surface of the upper drum 1 and the inner surface of the lower drum 2 are PEEK coated (material). This is an example in which quartz powder, which is a powder raw material, and ion-exchanged water, which is a liquid raw material, are kneaded using what is covered with.

Moreover, the comparative example 1 is the miscible powder | flour for foods which is a powder raw material, and a liquid raw material using what each manufactured the

rotary kneading boards

10 and 11, the scraping blade 31, the upper trunk | drum 1, and the lower trunk | drum 2 with stainless steel. This is an example in which a saline solution is kneaded. Comparative Example 2 is an example in which quartz powder, which is a powder raw material, and ion-exchanged water, which is a liquid raw material, are kneaded using the same apparatus configuration as Comparative Example 1. In Comparative Example 3, the rotary kneaders 10 and 11, the scraping blades 31, the upper body 1 and the lower body 2 are made of aluminum, respectively, and quartz powder as a powder raw material and ion-exchanged water as a liquid raw material are used. Is an example of kneading.

Further, in Examples 1 to 12 and Comparative Example 1, the solid content concentration of the slurry was the same as 60% by weight of the solid content (powder) with respect to the total weight of the slurry including the liquid. In Comparative Example 2, the solid content concentration of the slurry is 59 percent by weight of the solid content (powder) relative to the weight of the entire slurry including the liquid. In Comparative Example 3, the solid content concentration of the slurry is the entire slurry including the liquid. The weight percentage of the solid content (powder) with respect to the weight of was 63%. Moreover, the atmospheric temperature at the time of a test and the temperature of a powder raw material and a liquid raw material are 20 degreeC, respectively.
The viscosity was measured with a B-type viscometer BMII manufactured by Toki Sangyo Co., Ltd.

As can be seen from FIG. 7, in Comparative Examples 1 to 3, the inner surfaces of the apparatus constituent members involved in kneading are not covered with a coating or the like, and the base material has a dynamic friction coefficient of 0.6 or 0.5. It can be seen that the metal of aluminum or stainless steel is exposed as it is, and in this case, the viscosity of the slurry is 420 mPa · S to 640 mPa · S and the kneading does not proceed well. Due to this influence, the slurry temperature during kneading is relatively high at 56 ° C. to 60 ° C., and the discharge rate of the slurry does not reach 100% but remains at 85% or 95%.

On the other hand, as in the present invention (Examples 1 to 12), the inner surfaces of the apparatus constituent members involved in kneading are covered with a coating material having a low dynamic friction coefficient, or directly manufactured from a material having a low dynamic friction coefficient. In many cases, the viscosity of the slurry is 160 mPa · S to 435 mPa · S, indicating that the kneading proceeds well. Due to this influence, the slurry temperature during kneading was kept relatively low at 50 ° C., and the slurry discharge rate reached almost 100%, and it was confirmed that the slurry discharge property was also good.
In Examples 5 and 6, since TiCN or TiN is used as a coating material, the viscosity of the slurry is high and the slurry discharge ratio does not reach 100%, but the slurry temperature during kneading is 50 ° C. or less. It was confirmed that good results were obtained.

The present invention relates to a continuous kneading apparatus for continuously kneading a powder such as quartz powder and a liquid.

1 Upper barrel 1DD Inner flange 1B 1st kneading chamber 2 Lower barrel 2B 2nd kneading chamber 3 Powder feed cylinder 10 1st rotary kneading machine 11 2nd rotary kneading machine 20 Shear kneading part 21 Fixing plate 21a Cutting process ) 21b Cutting (uneven portion) 22 Rotating plate 50 (50A / 50B) Coating material

Claims

An upper cylinder to which a powder supply cylinder to which a quantified powder is supplied is connected and the powder is mixed with a liquid, and a lower cylinder connected concentrically to the upper cylinder on the lower side of the upper cylinder A continuous kneading apparatus for continuously kneading the powder and liquid with a first rotary kneading board built in the upper body and a second rotating kneading board built in the lower body. There,
A continuous kneader in which at least the surfaces of the first and second rotary kneaders are made of a material having a smaller coefficient of dynamic friction than metal.
In the first and second rotary kneaders, the surface of the base material is coated with a coating material,
The continuous kneading apparatus according to claim 1, wherein any one of DLC, PEEK, PTFE, TiN, and TiCN is used as the coating material.
The continuous kneading apparatus according to any one of claims 1 and 2, wherein inner surfaces of the upper body and the lower body are coated with a coating material having a smaller dynamic friction coefficient than metal.
The continuous kneading apparatus according to claim 3, wherein the coating material to be coated on the inner surfaces of the upper body and the lower body is PEEK.
The continuous kneading apparatus according to claim 1, wherein the first and second rotary kneaders are made of a resin material having a smaller dynamic friction coefficient than metal.
A shear kneading part is provided between the lower surface of the inner flange part in which the lower end of the upper body protrudes radially inward of the upper body and the upper surface of the second rotary kneading plate in the lower body,
The shear kneading portion has a fixed plate fixed to the lower surface of the inner flange portion, and a rotating plate fixed to the upper surface of the second rotary kneading plate and rotating together with the second rotary kneading plate,
By rotating the rotating plate in a state of being opposed to the upper surface of the fixed plate, a shearing force is applied to the kneaded product of the powder and liquid between the fixed plate and the rotating plate,
The continuous kneading apparatus according to any one of claims 1 to 5, wherein at least surfaces of the rotating plate and the fixed plate of the shear kneading unit are made of a material having a lower coefficient of dynamic friction than metal.
The continuous kneading apparatus according to claim 6, wherein uneven portions are formed on opposing surfaces of the stationary plate and the rotating plate of the shear kneading unit.
The continuous kneading apparatus according to claim 5, wherein the resin material having a lower dynamic friction coefficient than the metal is PEEK or PTFE.